US4634930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display device
Assignee: Mitsubishi Electric Corp
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Filing: 1985-02-01
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Granted: 1987-01-06
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Expires: 2005-02-01
Abstract
Abstract A display device comprising a cabinet and an electromagnetic deflection yoke and a horizontal width adjusting coil received is the cabinet comprises a canceling coil for cancelling electromagnetic field noise generated from the electromagnetic deflection yoke received in the cabinet.
Inventors
- 👤 Masayuki Toshiyasu
- 👤 Toshinari Kawahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:13
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/003; H01J2229/00; H01J2229/0007; H01J2229/0015
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
100 words
A display device for a computer mounted in close proximity thereto, said display device comprising: a cabinet, a cathode ray tube mounted in said cabinet; an electromagnetic deflection yoke mounted on said cathode ray tube; a horizontal width adjusting coil mounted in said cabinet; and a cancelling coil mounted in said cabinet for cancelling electromagnetic field noise generated from said electromagnetic deflection yoke and being arranged in the vicintiy of said cathode ray tube so that said electromagnetic field noise induces a current to flow therein, which causes a magnetic feed to be formed which reduces said electromagnetic field noise.
Claim 2
Dependent Claim
100 words
A display device for a computer mounted in close proximity thereto, said display device comprising: a cabinet, a cathode ray tube mounted in said cabinet; an electromagnetic deflection yoke mounted on said cathode ray tube; a horizontal width adjusting coil mounted in said cabinet; and a cancelling coil mounted in said cabinet for cancelling electromagnetic field noise generated from said electromagnetic deflection yoke and being arranged in the vicintiy of said cathode ray tube so that said electromagnetic field noise induces a current to flow therein, which causes a magnetic feed to be formed which reduces said electromagnetic field noise.
Claim 3
Dependent Claim
23 words
The display device according to claim 1, wherein a second current is induced in said cancelling coil by the horizontal width adjusting coil.
Claim 4
Dependent Claim
22 words
The display device according to claim 1, wherein said cancelling coil is constituted by a plurality of single turn short circuit rings.
Claim 5
Dependent Claim
22 words
The display device according to claim 1, wherein said cancelling coil is constituted by a single coil having a plurality of turns.
Claim 6
Dependent Claim
19 words
The display device according to claim 1, wherein said said cancelling oil is constituted by a short circuit ring.
Claim 7
Dependent Claim
41 words
The display device according to claim 1, wherein said cancelling coil is connected to a deflection output circuit including said electromagnetic deflection yoke to pass deflection current in the direction cancelling the electromagnetic field coil generated from said electromagnetic deflection yoke.
Claim 8
Dependent Claim
23 words
The display device according to claim 1, wherein at least a part of said cancelling coil is near said horizontal width adjusting coil.
Claim 9
Dependent Claim
23 words
The display device according to claim 5, wherein at least a part of said cancelling coil is near said horizontal width adjusting coil.
Claim 10
Dependent Claim
23 words
The display device according to claim 7, wherein at least a part of said cancelling coil is near said horizontal width adjusting coil.
Claim 11
Dependent Claim
31 words
The display device according to claim 1, wherein said cancelling coil is provided between a magnetic memory device of said computer used with said display device and said electromagnetic deflection coil.
Claim 12
Dependent Claim
31 words
The display device according to claim 5, wherein said cancelling coil is provided between a magnetic memory device of said computer used with said display device and said electromagnetic deflection coil.
Claim 13
Dependent Claim
31 words
The display device according to claim 6, wherein said cancelling coil is provided between a magnetic memory device of said computer used with said display device and said electromagnetic deflection coil.
Claim 14
Dependent Claim
31 words
The display device according to claim 7, wherein said cancelling coil is provided between a magnetic memory device of said computer used with said display device and said electromagnetic deflection coil.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-05 | 1990-07-07 | 1991-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-05 | 1994-07-07 | 1995-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-05 | 1998-07-07 | 1999-01-06 | $7700.00 | Window Closed / Lapsed |